20496389 has 4 divisors (see below), whose sum is σ = 20513580. Its totient is φ = 20479200.

The previous prime is 20496349. The next prime is 20496397. The reversal of 20496389 is 98369402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19096900 + 1399489 = 4370^2 + 1183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20496389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20496349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6662 + ... + 9239.

It is an arithmetic number, because the mean of its divisors is an integer number (5128395).

Almost surely, 2^20496389 is an apocalyptic number.

It is an amenable number.

20496389 is a deficient number, since it is larger than the sum of its proper divisors (17191).

20496389 is a wasteful number, since it uses less digits than its factorization.

20496389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17190.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20496389 is about 4527.2937832661. The cubic root of 20496389 is about 273.6691132484.

The spelling of 20496389 in words is "twenty million, four hundred ninety-six thousand, three hundred eighty-nine".